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  Update 1: 2017/03/31 11:27am PDT
  Notifications

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  Update 2: 2017/05/21 3:35pm PDT
  Android O Dev Preview 2 disabled the ability to toggle the categories in Android System’s notification channels. We hope that it’s a bug and not a deliberate lockdown, but it’s

Being able to run apps that draw on top of other apps is a powerful feature of Android. Apps like Twilight take advantage of that to add a filter to the display, but other apps just show a floating UI element.

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[Update: O DP2 broke notification channels] Android O feature spotlight: Android tells you if an app is displaying a screen overlay was written by the awesome team at Android Police.

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